Isolated RS485 Unit



Isolated RS485 Unit is an isolated half duplex transceiver based on the RS485 bus protocol. It can convert TTL level to RS485 level. Since various electrical noises and transient changes of voltage and current may affect communication, Using CA-IS3082W as an interface chip can effectively shield the above noise and provide sufficient protection for expensive control equipment and reduce the risk of damage.

Communication with RS485 devices requiring long-distance signal transmission is possible. The product has a failure protection function whereby in the receiving state, if the input is open or short circuited, the receiver output level is high.

RS485 is a communication protocol standard, which is used to define the electrical characteristics of drivers and receivers used in serial communication systems. It supports Multi-point Systems and is widely used in industrial fields.

When the project equipment needs communication control through RS485 and has high requirements for signal-to-noise ratio and transmission distance, it is a good choice to use ISO485 unit for interface type transfer.

Product Features

  • Built in CA-IS3082W isolation chip
  • Indicator light
  • Isolated DC-DC
  • Signal transmission rate: up to 500 Kbps
  • Fail safe receiver (bus open, short circuit)
  • Supports up to 256 bus nodes
  • Up to 1000 VRMs isolation and withstand voltage
  • Development platform: Arduino, UIflow (Blockly, Python)
  • 2X LEGO™ compatible holes


  • 1x Isolated RS485 Unit
  • 1x VH-3.96 4P
  • 1x 120Ω resistance
  • 1x Grove Cable(20cm)


  • Communication between RS485 interface device and micro controller in industrial equipment


Resources Parameter
Withstand voltage value 1000V
Maximum number of nodes 256个
Protection function Failure protection, over-current protection and thermal shutdown protection
New Weight 13g
Gross Weight 25g
Product Size 56mm*24mm*11mm
Package Size 70mm*55mm*13mm


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The A/B/C button sends a message to the ISO485 terminal, and the ISO485 received message will be displayed on the screen


Pin Map

ISO485 Unit RS485 RXD RS485 TXD 5V GND